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Nuclear Theory·nucl-th

Friday·September 4, 2015

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    Advances in the ab initio description of nuclear three-cluster systems

    Carolina Romero-Redondo🇺🇸 · Sofia Quaglioni🇺🇸 · Petr Navrátil🇨🇦 · Guillaume Hupin🇫🇷

    We introduce the extension of the ab initio no-core shell model with continuum to describe three-body cluster systems. We present results for the ground state of 6He and show improvements with respect to the description obtained within the no-core shell model and the no-core shell model/resonating group methods.

    nucl-thEPJ Web Conf.(2016)·0 citations
  2. 02

    Relativistic few-body methods

    Wayne Polyzou🇺🇸

    I discuss the role of relativistic quantum mechanics in few-body physics, various formulations of relativistic few-body quantum mechanics and how they are related.

    nucl-thhep-thEPJ Web Conf.(2016)·2 citations
  4. 04

    Two neutron decay of 16Be

    A.E. Lovell · F.M. Nunes · I.J. Thompson

    Recently, the first example of two-neutron decay from the ground state of an unbound nucleus, Be, was seen. Three-body methods are ideal for exactly treating the degrees of freedom important for these decays. Using a basis expansion over hyperspherical harmonics and the hyperspherical R-matrix method, we construct a realistic model of Be in order to investigate its decay mode and the role of the two-neutron interaction. The neutron-Be interaction is constrained using shell model predictions. We obtain a ground state for Be that is over-bound by approximately 1 MeV with a width of approximately 0.23 MeV. This suggests, that for such systems, the three-body force needs to be repulsive.

    nucl-thEPJ Web Conf.(2016)·0 citations
  5. 05

    Manifestations of dark matter and variations of fundamental constants in atoms and astrophysical phenomena

    Y. V. Stadnik🇦🇺 · V. V. Flambaum🇩🇪

    We present an overview of recent developments in the detection of light bosonic dark matter, including axion, pseudoscalar axion-like and scalar dark matter, which form either a coherently oscillating classical field or topological defects (solitons). We emphasise new high-precision laboratory and astrophysical measurements, in which the sought effects are linear in the underlying interaction strength between dark matter and ordinary matter, in contrast to traditional detection schemes for dark matter, where the effects are quadratic or higher order in the underlying interaction parameters and are extremely small. New terrestrial experiments include measurements with atomic clocks, spectroscopy, atomic and solid-state magnetometry, torsion pendula, ultracold neutrons, and laser interferometry. New astrophysical observations include pulsar timing, cosmic radiation lensing, Big Bang nucleosynthesis and cosmic microwave background measurements. We also discuss various recently proposed mechanisms for the induction of slow `drifts', oscillating variations and transient-in-time variations of the fundamental constants of Nature by dark matter, which offer a more natural means of producing a cosmological evolution of the fundamental constants compared with traditional dark energy-type theories, which invoke a (nearly) massless underlying field. Thus, measurements of variation of the fundamental constants gives us a new tool in dark matter searches.

    ↳ physics.atom-phastro-ph.COhep-phhep-th+110 citations
  6. 06

    Jet Quenching and Gluon to Hadron Fragmentation Function in Non-Equilibrium QCD at RHIC and LHC

    Gouranga C. Nayak🇺🇸

    Theoretical understanding of the observed jet quenching measurements at RHIC and LHC is challenging in QCD because it requires understanding of parton to hadron fragmentation function in non-equilibrium QCD. In this paper, by using closed-time path integral formalism, we derive the gauge invariant definition of the gluon to hadron fragmentation function in non-equilibrium QCD which is consistent with factorization theorem in non-equilibrium QCD from first principles.

    ↳ hep-phnucl-thPhys.Part.Nucl.Lett.(2017)·29 citations
  7. 07

    Transport coefficients of the Gribov-Zwanziger plasma

    Wojciech Florkowski🇵🇱 · Radoslaw Ryblewski🇵🇱 · Nan Su🇩🇪 · Konrad Tywoniuk🇪🇸

    We study dynamic features of a plasma consisting of gluons whose infrared dynamics is improved by the Gribov-Zwanziger quantization. This approach embodies essential features of color confinement which set the plasma apart from conventional quasiparticle systems in several aspects. Our study focusses on a boost-invariant expansion for in- and out-of-equilibrium settings, which at late times can be characterized by the sound velocity, , and the shear, , and bulk, , viscosities. We obtain explicit expressions for the transport coefficients and and check that they are consistent with the numerical solutions of the kinetic equation. At high temperature, keeping both the Gribov parameter and the relaxation time constant, we find a scaling which manifests strong breaking of conformal symmetry in contrast to the case of weakly coupled plasmas.

    ↳ hep-phhep-thnucl-thPRC(2016)·57 citations

Affiliations

first authorsco-authorsvia INSPIRE